Refrigerating car and chamber



(No Model.) I 3 Sheets-Sheet 1.

, E.HAMILTON.

RBFRIGERATING GAR AND CHAMBER.

No. 298,083. 7 Pat ented"MaJy6,1884.

I Fig.1.

WITNESSES (No Model.) 3 Sheets-Sheet 2.

E. HAMILTONQ I RBFRIGERATING CAR AND CHAMBER. No. 298,083. I Patented May 6, 1884.

I 1 Law;

3 Sheets-Sheet 3.

(No Model.)

Patented May 6, 1884.

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ArnN'r EDWARD HAMILTON, OF BOSTON, MASSACHUSETTS.

REFRIGERATING CAR AND CHAMBER.

SPECIFICATION forming part of Letters Patent No. 298,083, dated May 6, 1884-. Application filed April 30, 1883. (N0 model.) v

To aZZ whom, it may concern Be it known that I, EDWARD HAMILTON, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented acertain new and useful Improvement in Refrigerating Cars and Chainbers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature, in which Figure 1 represents in vertical cross-section a car provided with my improvement, which is shown in elevation and vertical section. Fig. 2 is a plan view, partly in sectionfof an end of a car, in which myinvention is shown in horizontal section. Figs. 3, 5, and 6 represent in perspective different forms of outer and inner tankcasings and the braces hereinafter described. Fig. 4. is a sectional view showing the outer and inner casings and the overflow-pipe or drip-tube. Figs. 7 to 18, inclusive, represent modifications of my invention, as will be more fully described hereinafter.

It is very important that refrigerators intended for the transportation of fresh meat,

vegetables, &c., long distances, should be so constructed as to employ freezing or cooling mixtures in comparatively large bulk or quanbe so arranged in tanks that they expose as large a part of their surface as shall be conducive to proper economy of use. It is also desirable that a circulation of air about the outer surface of the tanks holding the freezing-mixture be provided for, and that a large condensing-surface be obtained to free the air from moisture.

In my Patent No. 248,738, dated October 25, 1881, I describe a refrigerator having tanks for holding the cooling or freezing mixture, provided with air-passages and condensingsurfaces. The specific construction of the tanks therein described does not provide for the largest air-passages or the greatest area of condensin g-surface combined with the greatest ice-holding capacity in a given space, as by its construction the inner tank is reduced in size. My'present invention contemplates av change in the former shape of the inner represented by a.

and outer tanks and air-passages,whereby the largest storage capacity for the freezing-mixture and the greatest area of condensing-surface are obtained 5 but this change necessitated M the employment of posts, supports, or flanges interposed between the inner and outer shells of the tank at the corners or sides, to strengthen the construction and properly separate the two shells and form the air-passages in two or more sides of the tank.

Referring to Fig. 7, it will be seen-that the present construction consists, essentially, of the inner shell, 0!, and the outer shell, I). In each corner I place the braces or scantlings or j oists These are placed vertically and run, preferably, the Whole height of the outer shell. The freezing-mixture isplaced on the inside, as represented by 00, while 3/ g y 3 represent the air-passages or chimneys outside of the inner shell. These uprights or joists are inserted in order to stiffen and strengthen the construction of the tanks, and at the same time to allow the utmost possible surface for condensation by furnishing large passages upon each side for the circulation of air.

In Figs. 8, 9, and 10 I represent modified forms of construction, in each of which I gain a large condensing-surface and obtain the strength and stiffness afforded by the uprights. tities, and at the samev time that the mixture NVhere it is important to obtain nearly all of the surface around the inner shell for condensation, I employ angle-irons or stiffening-braces, which are used in substantially the same manner and for the same purpose as uprights shown in Fig. 1. These angle-irons are preferably made of iron, as represented in Figs. 13, 14, 15, and 16, and where especial strength is desired boards may be added, as represented in Fig. 12, e. It will be observed that in this construction I obtain three surfacesfor -condensationto wit, the outer surface of the inner shell, and both the inner and outer surfacesof the outer shell.

By theconstruction herein described I am enabled to obtain better results in a given space with freezing-mixture than by my previous invention.

The shells, braces, uprights, and angle-irons spoken of may all be made of metal, and when designed for cars it is preferable that they should be so made, as the construction is very strong and serviceable. I am enabled also, by this construction, to keep the air dry by a very small expenditure of ice, and with far less salt than is ordinarily employed for the same purpose.

The outer shell may be made removable from the inner, if desired to reduce the cooling capacity of the tanks, or for any other reason; and for the first-named reason -to wit, for reducing the cooling capacity of thetanksthe outer jacket or shell may be made in two or more sections, (see Fig. 3,) one or all of which may be removed at pleasure; or the outer casing may have one or more of its sides removable for the same reason, or may have openings formed therein, which are adapted to be closed by doors formed as shown in Fig. 5. By reducing the length of the passages between the two casings, or by lessening the number of such passages, the cooling capacity of the tanks is lessened, because less air can be brought in contact therewith and cooled and freed from moisture.

In order to increase the condensing-surfiace of the outer tank, it may be corrugated, as shown in Fig. 6. i

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. In a refrigerating-car or similar refrigerating-chamber, the tank (1, adapted for holding a freezing mixture, and the outer removable jacket or casing, 12, provided with an opening at the top and bottom, and a circulating-air space between the said jacket and tank, all arranged and combined substantially as and for the purposes set forth.

2. In combination, the independent metal refrigerating-tank a, provided with the outer metal shell, b, the interposed perpendicular joists or stays a arranged to form perpendicular air-passages upon the outside of the tank a, said passages being open both at the top and bottom for the free circulation of air, and presenting independent metal condensingsurfaces all outside the tank a, and all adapted to operate in the chamber of a refrigerating car or refrigerating-chambcr, substantially as and for the purposes set forth.

EDWARD HAMILTON.

Witnesses:

BoWDoIN S. PARKER, F. F. RAYMOND, 2d. 

